improved bloom system

android/assets/shaders/bright_filter.fsh

@@ -17,6 +17,6 @@ void main() {
 	if (brightness > 0.7) {
 		gl_FragColor = color;
 	} else {
-		gl_FragColor = vec4(0.0);
+		gl_FragColor = vec4(0.0, 0.0, 0.0, 0.0);
 	}
 }

android/assets/shaders/gaussian_blur.fsh

@@ -1,34 +1,47 @@
-#version 330 core
-#ifdef GL_ES
-#define LOWP lowp
-precision mediump float;
-#else
-#define LOWP
-#endif
-
-varying LOWP vec4 vColor;
+varying vec4 vColor;
 varying vec2 vTexCoord;
 
-uniform int horizontal;
 uniform sampler2D u_texture;
-uniform float weight[5] = float[] (0.227027, 0.1945946, 0.1216216, 0.054054, 0.016216);
+uniform vec2 resolution;
+uniform float radius;
+uniform int pass;
 
 void main() {
-  vec2 tex_offset = 1.0 / textureSize(u_texture, 0);
-  vec4 color = texture(u_texture, vTexCoord);
-  vec3 result = color.rgb * weight[0];
+	//this will be our RGBA sum
+	vec4 sum = vec4(0.0);
+	
+	//our original texcoord for this fragment
+	vec2 tc = vTexCoord;
+		
+	//the amount to blur, i.e. how far off center to sample from 
+	//1.0 -> blur by one pixel
+	//2.0 -> blur by two pixels, etc.
+	float blur = radius/resolution.y; 
+    
+	//the direction of our blur
+	//(1.0, 0.0) -> x-axis blur
+	//(0.0, 1.0) -> y-axis blur
+	float hstep = 1.0;
+	float vstep = 0.0;
+	
+	if (pass == 1) {
+		hstep = 0.0;
+		vstep = 1.0;
+	}
+    
+	sum += texture2D(u_texture, vec2(tc.x - 5.0*blur*hstep, tc.y - 5.0*blur*vstep)) * 0.014374;
+	sum += texture2D(u_texture, vec2(tc.x - 4.0*blur*hstep, tc.y - 4.0*blur*vstep)) * 0.035855;
+	sum += texture2D(u_texture, vec2(tc.x - 3.0*blur*hstep, tc.y - 3.0*blur*vstep)) * 0.072994;
+	sum += texture2D(u_texture, vec2(tc.x - 2.0*blur*hstep, tc.y - 2.0*blur*vstep)) * 0.121281;
+	sum += texture2D(u_texture, vec2(tc.x - 1.0*blur*hstep, tc.y - 1.0*blur*vstep)) * 0.164472;
+	
+	sum += texture2D(u_texture, vec2(tc.x, tc.y)) * 0.182049;
+	
+	sum += texture2D(u_texture, vec2(tc.x + 1.0*blur*hstep, tc.y + 1.0*blur*vstep)) * 0.164472;
+	sum += texture2D(u_texture, vec2(tc.x + 2.0*blur*hstep, tc.y + 2.0*blur*vstep)) * 0.121281;
+	sum += texture2D(u_texture, vec2(tc.x + 3.0*blur*hstep, tc.y + 3.0*blur*vstep)) * 0.072994;
+	sum += texture2D(u_texture, vec2(tc.x + 4.0*blur*hstep, tc.y + 4.0*blur*vstep)) * 0.035855;
+	sum += texture2D(u_texture, vec2(tc.x + 5.0*blur*hstep, tc.y + 5.0*blur*vstep)) * 0.014374;
 
-  if (horizontal == 1) {
-    for (int i = 1; i < 5; ++i) {
-      result += texture(u_texture, vTexCoord + vec2(tex_offset.x * i, 0.0)).rgb * weight[i];
-      result += texture(u_texture, vTexCoord - vec2(tex_offset.x * i, 0.0)).rgb * weight[i];
-    }
-  } else {
-    for (int i = 1; i < 5; ++i) {
-      result += texture(u_texture, vTexCoord + vec2(0.0, tex_offset.y * i)).rgb * weight[i];
-      result += texture(u_texture, vTexCoord - vec2(0.0, tex_offset.y * i)).rgb * weight[i];
-    }
-  }
-
-  gl_FragColor = vec4(result, color.a);
+	gl_FragColor = vColor * vec4(sum.rgb, 1.0);
 }

android/assets/shaders/gaussian_blur.vsh

@@ -0,0 +1,15 @@
+attribute vec4 a_position;
+attribute vec4 a_color;
+attribute vec2 a_texCoord0;
+
+uniform mat4 u_projTrans;
+
+varying vec4 vColor;
+varying vec2 vTexCoord;
+
+void main() {
+	vColor = a_color;
+	vTexCoord = a_texCoord0;
+	
+	gl_Position = u_projTrans * a_position;
+}